Method and device for providing different services in mobile communication system

ABSTRACT

The present disclosure relates to a method and device for providing different services in a mobile communication system. In an embodiment, a base station sets interference influence information including information about interference of a second signal of a second system using a second. TTI with regard to a first signal of a first system using a first transmission time interval (TTI). Also, the base station transmits the first signal of the first system to a terminal, and transmits the interference influence information to the terminal in a predetermined time. In a situation where different services coexist, an HARQ retransmission technique is provided for effectively overcoming a transmission failure caused by influence of interference between services.

CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY

The present application is related to and claims priority under 35U.S.C. §119(a) to Korean Patent Applications Serial Number10-2016-0070450 filed on Jun. 7, 2016 and Korean Patent ApplicationsSerial Number 10-2017-0055301 filed on Apr. 28, 2017, the contents ofwhich are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a method and device for providingdifferent services in a mobile communication system. More particularly,the present disclosure relates to a transmission/reception method forsupporting effective hybrid automatic repeat and request (HARQ) in anenvironment allowing coexistence between heterogeneous services.

BACKGROUND

In order to meet an increasing demand for wireless data traffic aftercommercialization of the 4^(th) generation (4G) communication system,great efforts are underway to develop an improved 5^(th) generation (5G)or pre-5G communication system. For this reason, the 5G communicationsystem or pre-5G communication system is also called the beyond-4Gnetwork communication system or the post LTE system.

In order to achieve a high data rate, the 5G communication systemconsiders implementation in super-high frequency (mmWave) bands (e.g.,60 GHz band). In addition, to alleviate the path loss of radio waves inthe super-high frequency bands and to increase the propagation distanceof radio waves, a variety of techniques such as beamforming, massivemulti-input multi-output (massive MIMO), full-dimensional MIMO(FD-MIMO), array antenna, analog beam-forming, and large scale antennaare now discussed in the 5G communication system.

Further, in order to improve the network of the system, the 5Gcommunication system has developed an evolved small cell, an advancedsmall cell, a cloud radio access network (cloud RAN), an ultra-densenetwork, device-to-device (D2D) communication, wireless backhaul, amoving network, cooperative communication, coordinated multi-points(CoMP), interference cancellation, and the like. Besides, in the 5Gsystem, hybrid FSK and QAM modulation (FQAM) and sliding windowsuperposition coding (SWSC) are studied as advanced coding modulation(ACM) scheme, and filter bank multi carrier (FBMC), non-orthogonalmultiple access (NOMA) and sparse code multiple access (SCMA) arestudied as advanced access technique.

Compared to the existing 4G system, the 5G system considers support forvarious services. As examples of such services, there are an enhancedmobile broadband (eMBB) service, an ultra-reliable and low latencycommunication (URLLC) service, a massive machine type communication(mMTC) service, an evolved multimedia broadcast/multicast service(eMBMS), and the like. Normally, a system for providing the URLLCservice may be referred to as a URLLC system, and a system for providingthe eMBB service may be referred to as an eMBB system. Also, the termsservice and system may be used interchangeably.

Among them, the URLLC service is a newly considered service in the 5Gsystem, unlike the existing 4G system. The URLLC service requires a veryhigh reliability (e.g., a packet error rate of about 10⁻⁵) and a lowlatency (e.g., about 0.5 msec) in comparison with other services. Inorder to meet such strict requirements, the URLLC service may require atransmission time interval (TTI) shorter than that of the eMBB service,and various operating schemes that utilize this are now considered.

SUMMARY

To address the above-discussed deficiencies, it is a primary object toprovide an HARQ retransmission technique for effectively overcoming atransmission failure caused by influence of interference betweenservices in a situation where different services coexist.

It is another object of the present disclosure to provide a new controlchannel for effectively operating the HARQ retransmission technique.

It is still another object of the present disclosure to provide anefficient operating method of a receiver utilizing the HARQretransmission technique and the new control channel.

The objects of the present disclosure are not limited to theabove-mentioned objects, and other objects not mentioned can beunderstood by those skilled in the art from the following description.

In order to accomplish the foregoing and other objects, a communicationmethod of a base station according to an embodiment of the presentdisclosure may include setting interference influence informationincluding information about interference of a second signal of a secondsystem using a second TTI with regard to a first signal of a firstsystem using a first transmission time interval (TTI); transmitting thefirst signal of the first system to a terminal; and transmitting theinterference influence information to the terminal in a predeterminedtime.

Additionally, the interference influence information may includeinformation indicating whether the first signal of the first system isaffected by interference of the second signal of the second system.

Additionally, the interference influence information may includeinformation about a region of the first signal of the first systemaffected by interference of the second signal of the second system.

Additionally, the method may further include retransmitting only asignal for a region of the first signal of the first system affected byinterference of the second signal of the second system, wherein theinterference influence information may include information about theinterference-affected region of the first signal of the first system,and information indicating that only the signal for theinterference-affected region of the first signal of the first system isretransmitted.

Additionally, the first system may be an enhanced mobile broad band(eMBB) system, and the second system may be an ultra-reliable and lowlatency communication (URLLC) system.

According to an embodiment of the present disclosure, a communicationmethod of a terminal may include receiving a first signal of a firstsystem using a first transmission time interval (TTI) from a basestation; receiving interference influence information includinginformation about interference of a second signal of a second systemusing a second TTI with regard to the first signal of the first systemfrom the base station in a predetermined time; receiving aretransmission signal for the first signal of the first system from thebase station; and performing a channel decoding of a received signal forthe retransmission signal by using the interference influenceinformation.

Additionally, the performing a channel decoding may include performingthe channel decoding without combining the received signal for theretransmission signal with the first signal of the first system if thefirst signal of the first system is affected by interference of thesecond signal of the second system.

Additionally, the performing a channel decoding may include performingthe channel decoding by combining the received signal for theretransmission signal with a signal of a region unaffected byinterference of the second signal of the second system in the firstsignal of the first system if the first signal of the first system isaffected by interference of the second signal of the second system.

Additionally, the performing a channel decoding may include performingthe channel decoding by combining the received signal for theretransmission signal with a signal of a region unaffected byinterference of the second signal of the second system in the firstsignal of the first system if the first signal of the first system isaffected by interference of the second signal of the second system andif the base station retransmits only the signal for theinterference-affected region of the first signal of the first system.

According to an embodiment of the present disclosure, a base station mayinclude a transceiver configured to transmit and receive a signal to andfrom a terminal; and a controller configured to set interferenceinfluence information including information about interference of asecond signal of a second system using a second TTI with regard to afirst signal of a first system using a first transmission time interval(TTI), to transmit the first signal of the first system to the terminal,and to transmit the interference influence information to the terminalin a predetermined time.

According to an embodiment of the present disclosure, a terminal mayinclude a transceiver configured to transmit and receive a signal to andfrom a base station; and a controller configured to receive a firstsignal of a first system using a first transmission time interval (TTI)from the base station, to receive interference influence informationincluding information about interference of a second signal of a secondsystem using a second TTI with regard to the first signal of the firstsystem from the base station in a predetermined time, to receive aretransmission signal for the first signal of the first system from thebase station, and to perform a channel decoding of a received signal forthe retransmission signal by using the interference influenceinformation.

According to embodiments of the present disclosure, it is possible toprovide an HARQ retransmission technique for effectively overcoming atransmission failure caused by influence of interference betweenservices in a situation where different services coexist. In addition,it is possible to provide a new control channel for effectivelyoperating the HARQ retransmission technique. Also, it is possible toprovide an efficient operating method of a receiver utilizing the HARQretransmission technique and the new control channel.

The effects obtainable by the present disclosure are not limited to theabove-mentioned effects, and other effects not mentioned can be clearlyunderstood by those skilled in the art from the following description.

Before undertaking the DETAILED DESCRIPTION below, it may beadvantageous to set forth definitions of certain words and phrases usedthroughout this patent document: the terms “include” and “comprise,” aswell as derivatives thereof, mean inclusion without limitation; the term“or,” is inclusive, meaning and/or; the phrases “associated with” and“associated therewith,” as well as derivatives thereof, may mean toinclude, be included within, interconnect with, contain, be containedwithin, connect to or with, couple to or with, be communicable with,cooperate with, interleave, juxtapose, be proximate to, be bound to orwith, have, have a property of, or the like; and the term “controller”means any device, system or part thereof that controls at least oneoperation, such a device may be implemented in hardware, firmware orsoftware, or some combination of at least two of the same. It should benoted that the functionality associated with any particular controllermay be centralized or distributed, whether locally or remotely.Definitions for certain words and phrases are provided throughout thispatent document, those of ordinary skill in the art should understandthat in many, if not most instances, such definitions apply to prior, aswell as future uses of such defined words and phrases.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumerals represent like parts:

FIG. 1 illustrates an example of coexistence between an eMBB packet anda URLLC packet according to an embodiment of the present disclosure.

FIG. 2 illustrates an example performance of a terminal depending onwhether an eMBB receiving terminal knows URLLC related information.

FIG. 3 illustrates an example operation between a base station and aterminal according to an embodiment of the present disclosure.

FIG. 4 illustrates example interference influence information in case ofcoexistence between an eMBB packet and a URLLC packet according to anembodiment of the present disclosure.

FIG. 5 illustrates an example operation of a base station according toan embodiment of the present disclosure.

FIG. 6 illustrates an example operation of a terminal according to anembodiment of the present disclosure.

FIG. 7 illustrates another example interference influence information incase of coexistence between an eMBB packet and a URLLC packet accordingto an embodiment of the present disclosure.

FIG. 8 illustrates an example operation of a base station according toanother embodiment of the present disclosure.

FIG. 9 illustrates an example operation of a terminal according toanother embodiment of the present disclosure.

FIG. 10 illustrates yet another example interference influenceinformation in case of coexistence between an eMBB packet and a URLLCpacket according to an embodiment of the present disclosure.

FIG. 11 illustrates an example retransmission packet of a base stationaccording to an embodiment of the present disclosure.

FIG. 12 illustrates an example operation of a base station according tostill another embodiment of the present disclosure.

FIG. 13 illustrates an example operation of a terminal according tostill another embodiment of the present disclosure.

FIG. 14 illustrates an example base station according to an embodimentof the present disclosure.

FIG. 15 illustrates an example terminal according to an embodiment ofthe present disclosure.

DETAILED DESCRIPTION

FIGS. 1 through 15, discussed below, and the various embodiments used todescribe the principles of the present disclosure in this patentdocument are by way of illustration only and should not be construed inany way to limit the scope of the disclosure. Those skilled in the artwill understand that the principles of the present disclosure may beimplemented in any suitably arranged in an electronic device.

Hereinafter, embodiments of the present disclosure will be described indetail with reference to the accompanying drawings.

In the following description of the present disclosure, well knownelements, functions, operations, techniques, etc. may not be describedor illustrated in detail to avoid obscuring the subject matter of thepresent disclosure.

In this disclosure, when it is stated that a certain element is “coupledto” or “connected to” another element, such elements may beelectrically, physically or logically coupled to or connected to eachother. Also, both elements may be directly coupled or connected to eachother, or a new element may exist between both elements. In addition,the terms “include”, “comprise”, and “have” as well as derivativesthereof, mean inclusion without limitation.

Elements shown in embodiments of this disclosure are used independentlyto represent different characteristic functions and do not necessarilymean that each element is composed of separate hardware or one softwareunit. Namely, respective elements are used exemplarily for convenienceof description, and at least two elements may be integrated into oneelement, or one element may be divided logically or physically into aplurality of elements to perform similar or different functions. Anycase is also included within the scope of the present disclosure,without departing from the essence of the present disclosure.

Some of elements used herein may not be essential for the presentdisclosure, but may be optional elements only to improve performance.This disclosure may be implemented with essential elements only or byfurther including optional elements.

In this disclosure, terms are defined in consideration of functions ofthis disclosure and may be varied depending on user or operator'sintention or custom. Therefore, the definition should be made based onthe contents throughout this description.

It will be understood that each block of the flowchart illustrations,and combinations of blocks in the flowchart illustrations, may beimplemented by computer program instructions. These computer programinstructions may be provided to a processor of a general purposecomputer, special purpose computer, or other programmable dataprocessing apparatus to produce a machine, such that the instructions,which are executed via the processor of the computer or otherprogrammable data processing apparatus, generate means for implementingthe functions specified in the flowchart block or blocks. These computerprogram instructions may also be stored in a computer usable orcomputer-readable memory that may direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operational steps to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that are executed on the computer or otherprogrammable apparatus provide steps for implementing the functionsspecified in the flowchart block or blocks.

The term “unit”, as used herein, may refer to a software or hardwarecomponent or device, such as a field programmable gate array (FPGA) orapplication specific integrated circuit (ASIC), which performs certaintasks. A unit may be configured to reside on an addressable storagemedium and configured to execute on one or more processors. Thus, amodule or unit may include, by way of example, components, such assoftware components, object-oriented software components, classcomponents and task components, processes, functions, attributes,procedures, subroutines, segments of program code, drivers, firmware,microcode, circuitry, data, databases, data structures, tables, arrays,and variables. The functionality provided for in the components andmodules/units may be combined into fewer components and modules/units orfurther separated into additional components and modules.

FIG. 1 illustrates an example coexistence between an eMBB packet and aURLLC packet according to an embodiment of the present disclosure, andFIG. 2 illustrates an example performance of a terminal depending onwhether an eMBB receiving terminal knows URLLC related information.

When a time point comes to transmit a packet corresponding to a secondservice provided by a second system requiring high reliability and lowlatency while transmitting a packet corresponding to a first serviceprovided by a first system having low reliability and less sensitivityto latency, a base station may allocate a resource to the packetcorresponding to the second service. For example, the first service maybe an enhanced mobile broadband (eMBB), and the first system may be aneMBB system. In addition, the second service may be an ultra-reliableand low latency communication (URLLC), and the second system may be aURLLC system. Hereinafter, for convenience of description, a mobilecommunication system in which the URLLC service and the eMBB service aresimultaneously supported will be described as an example. However, thepresent disclosure is not limited thereto and may be similarly appliedto other cases where different services are provided. For example, thepresent disclosure may also be applied to a mobile communication systemthat supports all of the URLLC service, the eMBB service, a massivemachine type communication (mMTC) service, and an evolved multimediabroadcast/multicast service (eMBMS).

The URLLC service requires a very high reliability (e.g., a packet errorrate of about 10−5) and a low latency (e.g., about 0.5 msec) incomparison with other services. For this reason, when it is time totransmit a URLLC packet 120 while transmitting an eMBB packet 110 asshown in FIG. 1, the base station may allocate a corresponding resourceto the URLLC packet 120 instead of the eMBB packet 110.

Additionally, in a downlink network environment, the eMBB system mayoperate by scheduling based on an eMBB transmission time interval (TTI)130. Also, the URLLC system may consider a scenario of operating byscheduling based on a shorter TTI 140. Here, the TTI 130 of eMBB mayalso be referred to as an eMBB TTI, a long TTI, a normal TTI, a firstTTI, and the like, all of which mean a TTI applied to the eMBB service.The TTI 140 of URLLC may also be referred to as a URLLC TTI, a shortTTI, a second TTI, and the like, all of which mean a TTI applied to theURLLC service. Meanwhile, although FIG. 1 shows that the URLLC TTI 140is shorter than the eMBB TTI 130, this is not construed as a limitation.Alternatively, the URLLC TTI 140 may be longer than or equal to the eMBBTTI 130. However, for convenience of explanation, it is assumed that theURLLC TTI 140 is shorter than the eMBB TTI 130 by way of example. On theother hand, a terminal that receives or is able to receive the eMBBpacket 110 through the eMBB service may be referred to as a terminal, aneMBB terminal, an eMBB receiving terminal, or the like for convenienceof explanation.

As mentioned above, when it is time to transmit the URLLC packet 120while transmitting the eMBB packet 110, the base station may allocate acorresponding resource to the URLLC packet 120 rather than to the eMBBpacket 110. In this case, the eMBB packet 110 is affected as ifpuncturing or removing all data symbols to be transmitted in thecorresponding resource.

According to this operation scheme, the resource allocation schedulingof the URLLC packet 120 can be performed after transmission of an eMBBcontrol signal 115, so that it cannot guarantee that the base stationtransmits the eMBB control signal 115 that contains information aboutthe presence or not of the URLLC packet 120 and related information.Therefore, the eMBB receiving terminal, i.e., the terminal capable ofreceiving the eMBB packet cannot receive the URLLC related informationby means of the eMBB control signal 115.

In this case, the eMBB packet 110 may be affected by interference of theURLLC packet 120. Hereinafter, this interference caused by the URLLCpacket 120 will be referred to as a URLLC interference, a URLLCinterference signal, an interference influence signal, a URLLCinterference influence signal, and the like, and information about theURLLC interference signal will be referred to as URLLC interferencesignal related information, interference signal information,interference influence information, and the like.

In this case, if the eMBB receiving terminal does not know informationabout the presence of the URLLC packet 120 in the allocated resourcearea thereof, the reception performance of the eMBB packet 110 may beconsiderably degraded as shown in FIG. 2.

In addition, FIG. 2 shows that, if the terminal that receives the eMBBpacket cannot reflect the URLLC related information in the receivingtechnology, the eMBB packet may experience a very large performancedeterioration even through the transmission signal of URLLC isconsiderably small.

Referring to FIG. 2, the case where the eMBB receiving terminal does notknow whether there is puncturing in a part of a resource area allocatedthereto is denoted as 210, and the case where the eMBB receivingterminal knows whether there is puncturing in such a part is denoted as220. In the former case, the eMBB receiving terminal recognizes theURLLC data as the eMBB's own data and thus cannot decode received data.As a result, when a signal to noise ratio (SNR) increases, a block errorrate (BLER) is hardly reduced.

On the other hand, in the latter case, the eMBB receiving terminal has adecreased BLER value according as the SNR increases. Therefore, comparedwith the case where the eMBB receiving terminal does not know whetherthere is puncturing in a part of the resource area allocated thereto,the eMBB receiving terminal can perform decoding in the case of knowingwhether there is puncturing in such a part.

Actually, in the experimental environment of FIG. 2, the transmissionsignal of URLLC is merely about 10% or less of the transmission signalof eMBB. The reason for this performance deterioration is that the eMBBreceiving terminal regards the signal of URLLC as the signal of the eMBBreceiving terminal and attempts to decode a channel by utilizing thesignal of URLLC.

Therefore, if the eMBB receiving terminal exactly knows the position ofa resource used by URLLC, the eMBB reception performance is greatlyimproved as seen from FIG. 2. For this reason, the eMBB receivingterminal needs to know whether there is a resource used by URLLC in theallocated resource of the eMBB receiving terminal, but there is a casewhere the eMBB receiving terminal fails to obtain such informationdepending on operational techniques.

In this case, the eMBB receiving terminal may perform a channel decodingand a cyclic redundancy check (CRC) for a currently received signal in astate of failing to know information about an interference signalgenerated by the URLLC packet 120. Additionally, when a CRC failureoccurs, the eMBB receiving terminal may transmit a NACK signal to thebase station to apply a hybrid automatic repeat request (HARQ) method.

When a receiver, i.e., the eMBB receiving terminal, transmits the NACKsignal, a transmitter, i.e., the base station, may retransmit theprevious transmission signal at the next scheduling time. At this time,the base station may retransmit the same signal as the previoustransmission signal to the eMBB receiving terminal. Alternatively, inother embodiments, the base station may transmit another version ofparity bits for the previous transmission signal to the eMBB receivingterminal, or may send a new redundancy version formed in a combinationof the above two methods. Accordingly, the eBB receiving terminal mayreceive the retransmission signal sent from the base station, combinethe retransmission signal with the previous received signal, and performa channel decoding.

Normally, the receiver (i.e., the eMBB receiving terminal) calculates alog-likelihood ratio (LLR) value per bit of a received signal and entersthe log-likelihood ratio (LLR) value per bit as an input to a channeldecoder. If a CRC fail occurs in the previous received signal due to theinfluence of a channel, the LLR has a value close to 0 since it isdifficult to determine what the received signal is.

By the way, if the eMBB receiving terminal regards a URLLC signal as thesignal of the eMBB receiving terminal and performs a channel decoding ina situation where the eMBB packet 110 is affected by interference of theURLLC packet 120, the LLR value has a large value rather than a valueclose to zero even though a CRC fail occurs. The reason that the CRCfail occurs is not a damage due to the influence of a channel but thatthe eMBB receiving terminal erroneously selects the received signal ofthe eMBB receiving terminal region due to erroneous information.Therefore, when the eMBB receiving terminal stores a received signal andthen performs a channel decoding by combining with an HARQretransmission signal, a greater performance deterioration may begenerated rather than a case of not combining with the previous receivedsignal. It is therefore necessary to apply more efficient HARQtransmission/reception technique than typical HARQtransmission/reception technique in an environment where such situationsoccur.

Meanwhile, in another embodiment, the eMBB receiving terminal mayperform a blind detection for URLLC interference signal relatedinformation and then use the URLLC interference signal for receivingtechnique. In this case, the performance of the eMBB receiving terminalmay be greatly improved as compared with a case of not utilizing theURLLC interference signal related information. However, if an erroroccurs in the result of a blind detection performed by the eMBBreceiving terminal, the same problem as in a terminal that does notutilize the URLLC interference signal related information may appear.Therefore, in a system in which the eMBB service and the URLLC serviceare simultaneously supported, it is necessary to apply more efficientHARQ transmission/reception technique than typical HARQtransmission/reception technique.

In still another embodiment, a scenario may be considered in which theeMBB system and the URLLC system are scheduled and operated based on theeMBB TTI 130 in a downlink network environment. In this case, since thebase station can also schedule the URLLC system at the time ofscheduling the eMBB system, the base station can inform the eMBBreceiving terminal of the existence of the URLLC packet 120 in theallocated resource of the eMBB receiving terminal through the controlchannel 115.

However, since information about the presence or absence of the URLLCpacket 120 should be notified in units of small resource blocks, theamount of the information is likely to be very large. Therefore, if thisinformation is notified to the eMBB receiving terminal through thecontrol channel 115, the overhead of the control channel 115 may beincreased considerably.

Therefore, it may be better that the base station partly provides theterminal with a clue to enable a blind detection of the information withsuitable complexity through the control channel 115 such that the eMBBreceiving terminal can blindly detect detailed information related toURLLC by utilizing this information. However, when an error occurs inthe result of a blind detection performed by the terminal, the sameproblem as in the terminal that does not utilize the URLLC informationmay appear. Therefore, in a system in which eMBB and URLLC aresimultaneously supported even in a case where a part of URLLCinformation can be delivered through the control channel 115, it isnecessary to apply more efficient HARQ transmission/reception techniquethan typical HARQ transmission/reception technique.

Accordingly, when a NACK signal is received in response to a signaltransmitted to the terminal, the base station according to an embodimentof the present disclosure may also transmit, in the transmission of aHARQ retransmission packet, interference influence informationindicating whether any interference occurs due to a URLLC signal. Also,in the reception of the HARQ retransmission packet, the terminal mayperform a channel decoding of the received packet by using theinterference influence information.

In an alternative embodiment, when the URLLC signal interferes with theeMBB signal, the base station may transmit information about theoccurrence of interference due to the URLLC signal to the terminal aftera given time even before receiving the NACK signal from the terminal.Also, the base station may transmit the retransmission packet of theeMBB signal to the terminal after a given time even before receiving theNACK signal from the terminal.

FIG. 3 illustrates an example operation between a base station and aterminal according to an embodiment of the present disclosure.

Referring to FIG. 3, at step 350, the base station 310 may transmit anew signal to the terminal 320. Here, the terminal 320 is a devicecapable of receiving an eMBB signal and thus may be referred to as aneMBB receiving terminal. The base station 310 can support both the eMBBservice and the URLLC service, and the terminal 320 can receive a URLLCsignal as well as the eMBB signal. The new signal is a signal associatedwith the first system, for example, the eMBB signal. The signalassociated with the first system may be affected by interference of asignal associated with the second system. For example, the signalassociated with the second system may be the URLLC signal.

Thereafter, in response to the signal received at step 350, the terminal320 may transmit an ACK or NACK signal to the base station 310 at step360.

If the base station 310 receives the NACK signal at step 360, the basestation 310 may retransmit a packet to the terminal 320 at step 370.When retransmitting the packet, the base station 310 may also transmitinterference influence information of the signal transmitted at step 350to the terminal 320.

The interference influence information may include interference signalrelated information. Namely, if the signal transmitted at step 350 bythe base station 310 is affected by interference of a signal of anothersystem, the interference influence information may include informationabout occurrence of interference. For example, the interferenceinfluence information may include information indicating whetherinterference has occurred in the signal transmitted at step 350 by thebase station 310 due to a signal transmitted from any other system.Namely, the base station 310 may transmit information indicating whetherthe first system signal is affected at step 350 by interference of thesecond system signal, together with the retransmission of the packet atstep 370.

In addition, although not shown, the terminal 320 may receive aretransmitted packet and perform a channel decoding using theinterference influence information.

Specifically, the interference influence information may includeinformation indicating whether interference has occurred in a signalpreviously transmitted by the base station 310 due to a signal of anyother system, and this information may be contained in the form of anidentifier. This identifier may be referred to as an interferenceinfluence identifier. For example, the interference influenceinformation may include information indicating whether the eMBB packettransmitted at step 350 is affected by interference of the URLLC packet.In this case, a URLLC interference influence identifier may be containedin the interference influence information. If there is any interferenceof the URLLC packet, the URLLC interference influence identifier may beone. If there is no interference, the URLLC interference influenceidentifier may be zero. Or vice versa.

The terminal 320 that receives the interference influence identifier maydetermine whether a previously received signal is affected byinterference from a signal of another system. If so, the terminal 320may not combine the retransmission signal, received at step 370, withthe signal received at step 350.

Depending on embodiments, the interference influence information mayfurther include information about a region affected by interference dueto a signal of another system, in addition to the interference influenceidentifier. In this case, the information about the region affected byinterference may be contained in the interference influence informationin the form of an identifier. This may be referred to as an interferenceregion identifier. If the interference is caused by the URLLC systemsignal, the interference influence region identifier may be referred toas a URLLC interference influence region identifier. In anotherembodiment, if the interference influence information includesinformation about a region affected by interference, the interferenceinfluence information may not include the interference influenceidentifier.

The terminal 320 that receives both the interference influenceidentifier and the interference influence region identifier may select aregion, not affected by interference due to a signal of other system, inthe previously received signal, i.e., the signal received at step 350.Then, for only the selected region, combining with the retransmissionsignal and channel decoding may be performed.

In addition, depending on embodiments, the base station 310 mayretransmit, at step 370, only a signal of a region affected byinterference due to a signal of another system. In this case, theinterference influence information may further include information abouta retransmission signal type, in addition to the interference influenceidentifier and the interference influence region identifier. Theinformation about the retransmission signal type may include informationabout whether the base station 310 retransmits only a signal for aregion affected by interference due to a signal of another system atstep 370. This information about the retransmission signal type may becontained in the interference influence information in the form of aretransmission type identifier. This may also be referred to as aretransmission signal type identifier. In another embodiment, if theinterference influence information includes information about a regionaffected by interference and information about a retransmission signaltype, the interference influence information may not include theinterference influence identifier.

The terminal 320 that receives the interference influence identifier,the interference influence region identifier, and the retransmissiontype identifier may select a signal of a region, not affected byinterference due to a signal of other system, in the previously receivedsignal, i.e., the signal received at step 350. Then, a channel decodingmay be performed using a received signal for the retransmission signalas an additional parity of the signal for the selected region.

Meanwhile, although it is shown in the drawings that the base station310 transmits the interference influence information to the terminal 320upon receiving the NACK signal from the terminal 320, this is not to beconstrued as a limitation. For example, if the URLLC signal interfereswith the eMBB signal transmitted by the base station 310 at step 350,the base station 310 may transmit the interference influence informationto the terminal 320 after a given time before receiving the HARQACK/NACK signal from the terminal 320. Also, the base station 310 maytransmit the eMBB retransmission packet to the terminal 20 after a giventime before receiving the HARQ ACK/NACK signal from the terminal 320.

Specifically, in case of transmitting the eMBB signal to the terminal320 at step 350, the base station 310 may have already known whether theeMBB signal is affected by interference of the URLLC signal, even beforereceiving the NACK signal from the terminal 320. Therefore, even beforethe NACK signal is received from the terminal 320, the base station 310may transmit the interference influence information to the terminal 320after transmitting the eMBB signal. For example, if the eMBB signal istransmitted in the n-th eMBB TTI, the interference influence informationmay be transmitted through the (n+k)-th eMBB TTI. Here, the (n+k)-theMBB TTI may be ahead of the retransmission eMBB TTI according to theHARQ ACK/NACK.

The terminal 320 may receive the interference influence informationbefore transmitting the HARQ NACK signal and may confirm that the eMBBsignal is affected by interference of the URLLC signal.

In addition, the base station 310 may transmit the retransmission signalwhile or after transmitting the interference influence information tothe terminal 320. Namely, the base station 310 may transmit theretransmission signal even before receiving the HARQ ACK/NACK signalfrom the terminal 320. At this time, the retransmission signal mayinclude only the eMBB signal for the region affected by interference.

Meanwhile, the interference influence information may be included in thecontrol channel and transmitted to the terminal. For example, theinterference influence information may be added to the PDCCH or EPDCCHwith an m-bit identifier (m is a predetermined value of 1 or more) andtransmitted to the terminal.

Now, detailed operations of the base station 310 and the terminal 320will be described.

FIG. 4 illustrates an example interference influence information in caseof coexistence between an eMBB packet and a URLLC packet according to anembodiment of the present disclosure, FIG. 5 illustrates an exampleoperation of a base station according to an embodiment of the presentdisclosure, and FIG. 6 illustrates an example operation of a terminalaccording to an embodiment of the present disclosure.

As described above, the first and second services may be provided by thefirst system using the first TTI 440 and the second system using thesecond TTI 450, respectively, by the base station 310 and the terminal320. Hereinafter, it is assumed that the first system using the firstTTI 440 is an eMBB system and the second system using the second TTI 450is a URLLC system. In addition, a subframe 430 is divided into the firstregion 431 to the seventh region 437 in units of time corresponding tothe second TTI 450. Although FIG. 4 exemplarily shows that the subframe430 is divided into seven regions, this is not to be construed as alimitation. Depending on the lengths of the first TTI 440 and the secondTTI 450, the subframe 430 may be divided into more than or less thanseven regions. Each of the first to seventh regions 431 to 437 mayinclude at least one orthogonal frequency division multiplexing (OFDM)symbol. For example, each region may include two OFDM symbols.

An eMBB packet 410 may be transmitted through a specific frequencyregion of all the subframes 430; 431, 432, 433, 434, 435, 436 and 437according to the first TTI 440. In addition, URLLC packets 420 and 425may be scheduled according to the second TTI 450. If a time point comesto transmit the URLLC packets 420 and 425 while transmitting the eMBBpacket 410, the base station 310 may allocate resources to the URLLCpackets 420 and 425. For example, the first URLLC packet 420 may betransmitted in the third region 433, and the second URLLC packet 425 maybe transmitted in the sixth area 436. Additionally, the eMBB packet 410may be affected by interference of the first and second URLLC packets420 and 425. According to an embodiment, as shown in FIG. 4, the eMBBpacket 410 may be completely affected by interference of the first URLLCpacket 420 in the third region, and the eMBB packet 410 may be partiallyaffected by interference of the second URLLC packet 425 in the sixthregion 436.

In this case, the base station 310 may inform the terminal 320 ofinformation 460 as to whether a transmission signal before an HARQretransmission packet is affected by interference due to a signal of anyother system.

For this, when a retransmission request signal (e.g., a NACK signal) isreceived from the terminal 320, the base station 310 may transmit aretransmission signal including interference influence information tothe terminal 320 during retransmission of the eMBB packet. Here, theinterference influence information may include an interference influenceidentifier 460, e.g., a URLLC interference influence identifier. In caseof FIG. 4, the base station 310 may set the URLLC interference influenceidentifier 460 to correspond to true (e.g., may set the interferenceinfluence identifier 460 to 1) and insert the URLLC interferenceinfluence identifier 460 into the retransmission signal to betransmitted to the terminal 320.

Alternatively, in another embodiment, the base station 310 may transmitthe interference influence information 460 to the terminal 320 beforereceiving the HARQ ACK/NACK signal from the terminal 320. Also, the basestation 310 may retransmit the eMBB packet affected by interference tothe terminal 320 before receiving the HARQ ACK/NACK signal from theterminal 320.

Meanwhile, in still another embodiment, the base station 310 may add theURLLC interference influence identifier 460 to a control channel to betransmitted to the terminal 320. For example, the URLLC interferenceinfluence identifier 460 may be added to PDCCH or EPDCCH as a 1-bitidentifier and then transmitted to the terminal 320. Also, in yetanother embodiment, the interference influence identifier 460 may betransmitted through downlink control information (DCI) of the PDCCH.

The operation of the base station 310 will be described in more detailwith reference to FIG. 5. At step 510, the base station 310 may createan eMBB transmission (Tx) signal. The eMBB transmission signal is asignal serviced by the eMBB system using the first TTI 440, and mayinclude the eMBB packet and control information thereof.

At step 520, the base station 310 may determine whether the eMBBtransmission signal is affected by the URLLC transmission signal.Namely, the base station 310 may determine whether the eMBB packet 410is affected by interference of the URLLC packets 420 and 425.

If the eMBB packet 410 is affected by interference of the URLLC packets420 and 425, the base station 310 may set, at step 530, informationabout whether there is influence of URLLC interference. For example, thebase station 310 may set the URLLC interference influence identifier 460to correspond to true (e.g., set the URLLC interference influenceidentifier 460 to 1). The URLLC interference influence identifier 460may be stored in the base station 310 until a response signal for thetransmission signal is received. Then the base station 310 may transmitthe eMBB signal to the terminal 320. In another embodiment, when theeMBB packet 410 is affected by interference of the URLLC packets 420 and425, the base station 310 may transmit the set URLLC interferenceinfluence identifier 460 to the terminal 320. Namely, even beforereceiving the HARQ ACK/NACK signal from the terminal 320, the basestation 310 may transmit the eMBB signal and then transmit theinterference influence information 460 to the terminal 320 at step 530.For example, if the eMBB signal is transmitted in the n-th eMBB TTI, theinterference influence information 460 may be transmitted through the(n+k)-th eMBB TTI. In this case, the (n+k)-th eMBB TTI may be ahead ofthe retransmission eMBB TTI according to the HARQ ACK/NACK. Also, thebase station 310 may retransmit the eMBB packet at step 560 regardlessof whether the terminal 320 has received the HARQ NACK signal. Forexample, if the eMBB signal is transmitted in the n-th eMBB TTI, theretransmission eMBB packet may be transmitted through the (n+k)-th eMBBTTI which may be ahead of the retransmission eMBB TTI according to theHARQ ACK/NACK.

On the other hand, if the eMBB packet 410 is not affected byinterference of the URLLC packets 420 and 425, the base station 310 mayset, at step 540, the URLLC interference influence identifier 460 tocorrespond to be false (e.g., set the URLLC interference influenceidentifier 460 to 0). The URLLC interference influence identifier 460may be stored in the base station 310 until a response signal for thetransmission signal is received. Then the base station 310 may transmitthe eMBB signal to the terminal 320.

Meanwhile, in another embodiment, the base station 310 may transmit theeMBB signal to the terminal 320 at step 530 or 540 and then check aresponse message for the eMBB transmission signal at step 550. Namely,the base station 310 may confirm receipt of the ACK or NACK signal forthe eMBB transmission signal.

If the ACK signal for the transmission signal is received, the basestation 310 may create the next eMBB transmission signal and transmitthe created signal to the terminal 320 at step 570. In this case,operations similar to steps 510 to 550 may be performed. In someembodiment, the base station 310 may initialize the URLLC interferenceinfluence identifier 460 stored at step 530 or 540 if the ACK signal isreceived from the terminal 320.

On the other hand, if the NACK signal for the transmission signal isreceived, the base station 310 may retransmit the eMBB packet at step560. At this time, the base station 310 may transmit the URLLCinterference influence identifier 460 set at step 530 or 540 to theterminal 320 together with the retransmission signal. In someembodiment, the base station 310 may add the URLLC interferenceinfluence identifier 460 to the control channel and transmit the URLLCinterference influence identifier 460 to the terminal 320. For example,the URLLC interference influence identifier 460 may be added to PDCCH orEPDCCH as a 1-bit identifier and transmitted to the terminal 320. Also,in some embodiment, the base station 310 may initialize the URLLCinterference influence identifier 460 after transmitting theretransmission signal including the URLLC interference influenceidentifier 460 to the terminal 320.

Next, the operation of the terminal 320 will be described in more detailwith reference to FIG. 6. At step 610, the terminal 320 may receive asignal. This signal may be an eMBB signal. In some embodiment, theterminal 320 may perform channel compensation and create a bit LLR forthe received signal.

At step 620, the terminal 320 may determine whether the signal receivedat step 610 corresponds to a new signal or a retransmission signal.

If it is determined at step 620 that the signal received at step 610 isa new signal, the terminal 320 may perform a channel decoding at step660.

On the other hand, if it is determined at step 620 that the signalreceived at step 610 is not new signal, the terminal 320 may determinethis signal as a retransmission signal.

In addition, at step 630, the terminal 320 may check the interferenceinfluence information contained in the received retransmission signal.Since the interference influence information may include the URLLCinterference influence identifier 460, the terminal 320 may confirmwhether the signal received before the retransmission signal received atstep 610 is affected by interference of the URLLC packets 420 and 425.Namely, by checking the URLLC interference influence identifier 460, theterminal 320 may know whether the previously received signal is affectedby interference of a signal of the URLLC system.

If it is determined that the previously received signal is not affectedby interference of the URLLC signal, the terminal 320 may combine, atstep 640, the currently received retransmission signal with the LLRstored for the previously received signal.

On the other hand, if it is determined that the previously receivedsignal is affected by interference of the URLLC signal, the terminal 320may not combine, at step 650, the currently received retransmissionsignal with the LLR stored for the previously received signal.

As described above, if the terminal 320 regards the URLLC signal as thesignal of the terminal 320 and performs a channel decoding in asituation where the eMBB packet 410 is affected by interference of theURLLC packets 420 and 425, and if a CRC fail occurs accordingly, the LLRvalue has a large value rather than a value close to zero. Therefore,when the terminal 320 stores such a received signal and then performs achannel decoding by combining with the retransmission signal, a largedeterioration may be caused. Therefore, at step 650, the terminal 320may not combine the currently received retransmission signal with theLLR of the previously received signal at step 650.

After step 640 or 640 or if the new signal is received as a result ofdetermination at step 620, the terminal 320 may perform a channeldecoding at step 660. Then the terminal 320 may perform a CRC check atstep 670.

If the CRC check is successful, the terminal 320 may transmit an ACKmessage to the base station 310 at step 680.

If the CRC check fails, the terminal 320 may transmit a NACK message tothe base station 310 at step 690. At this time, in some embodiment, theterminal 320 may create and store a bit LLR for the currently receivedsignal. Alternatively, the terminal 320 may store the LLR created atstep 610. Thereafter, the terminal 320 receives the signal retransmittedby the base station 310 in response to the NACK message, and may performsteps 610 to 670.

As discussed heretofore, the base station 310 may add a 1-bit indicatorto the control channel of the HARQ retransmission packet so as to informwhether the previous transmission signal of the HARQ retransmissionpacket is affected by interference of a signal of any other system, andthen transmit the 1-bit indicator to the terminal 320. Alternatively,the base station 310 may transmit the interference influence informationto the terminal 320 even before receiving the HARQ ACK/NACK signal fromthe terminal 320. Also, the base station 310 may transmit the eMBBretransmission packet to the terminal 320 even before receiving the HARQACK/NACK signal from the terminal 320.

Then the terminal 320 receives the interference influence informationand the HARQ retransmission packet and, if the previously receivedsignal is affected by interference of the signal of any other system,may perform a channel decoding without combining the previously receivedsignal with the retransmission signal.

FIG. 7 illustrates another example interference influence information incase of coexistence between an eMBB packet and a URLLC packet accordingto an embodiment of the present disclosure, FIG. 8 illustrates anexample operation of a base station according to another embodiment ofthe present disclosure, and FIG. 9 illustrates an example operation of aterminal according to another embodiment of the present disclosure.

Referring to FIG. 7, the eMBB packet 410 may be transmitted through aspecific frequency region of all the subframes 430; 431, 432, 433, 434,435, 436 and 437 according to the first TTI 440. In addition, the URLLCpackets 420 and 425 may be scheduled according to the second TTI 450.For example, as earlier described in FIG. 4, the first URLLC packet 420may be transmitted in the third region 433, and the second URLLC packet425 may be transmitted in the sixth area 436.

In this case, the base station 310 may inform the terminal 320 ofinformation as to whether a transmission signal before an HARQretransmission packet is affected by interference due to a signal of anyother system. In addition, as earlier described in FIGS. 3 to 6,interference influence information 700 may include an interferenceinfluence identifier 710, e.g., a URLLC interference influenceidentifier.

Additionally, the interference influence information 700 may furtherinclude information 720 about a region affected by interference due to asignal of another system. In this case, the information 720 about theregion affected by interference may be referred to as an interferenceinfluence region identifier 720, e.g., a URLLC interference influenceregion identifier. If the interference influence information 700 has theinformation 720 about the region affected by interference, theinterference influence information 700 may not include the interferenceinfluence identifier 710 in some embodiment.

For example, the base station 310 may set the interference influenceregion identifier 720 to indicate whether the previous transmissionsignal for one or more OFDM symbols has been affected by interferencedue to a signal of another system. In case of indicating whether theprevious transmission signal for one OFDM symbol has been affected byinterference, the interference influence region identifier 720 may be a14-bit identifier (based on LTE subframe (14 OFDM symbols)) since a1-bit identifier can be added per OFDM symbol. Alternatively, in case ofindicating whether the previous transmission signal for two OFDM symbolshas been affected by interference, the interference influence regionidentifier 720 may be a 7-bit identifier since a 1-bit identifier can beadded per 2 OFDM symbols. In other embodiments, the interferenceinfluence region identifier 720 may be a 5-bit identifier for 3 OFDMsymbols, or a 3-bit identifier for 4 OFDM symbols. Also, depending onembodiments, the interference influence region identifier 720 may be setaccording to one or more slots, according to one or more resource blocks(RBs) or physical resource blocks (PRBs), according to one or more RBgroups, according to one or more resource elements (REs), according toone or more RE groups, according to one or more code blocks (CB),according to one or more CB group, according to one or more symbolgroups, according to one or more mini-slot groups, according to one ormore slots, or according to one or more transport blocks (TBs). Here,the slot may correspond to the normal TTI (long TTI) 130 shown in FIG.1, a mini-slot may correspond to the short TTI 140, and the mini-slotgroup may include a plurality of mini-slots 140.

In addition, for each region of the interference influence regionidentifier 720, the identifier may be set to correspond to be true(e.g., 1) in case of the region in which the previous transmissionsignal is affected by interference due to a signal of another system,and may be set to correspond to be false (e.g., 0) in case of the regionnot affected by interference.

In a situation as shown in FIG. 7, the eMBB packet 410 transmitted inthe first region 431, the second region 432, the fourth region 434, thefifth region 435 and the seventh region 437 is not affected byinterference of the URLLC packets 420 and 425. However, the eMBB packet410 transmitted in the third region 433 is affected by interference ofthe first URLLC packet 420, and the eMBB packet 410 transmitted in thesixth region 436 is affected by interference of the second URLLC packet425. In this case, the interference influence region identifier 720 maybe set as “0010010” to indicate information about theinterference-affected region. This is, however, exemplary only and notto be construed as a limitation. Any other form of the interferenceinfluence region identifier 720 capable of indicate the third and sixthregions 433 and 436 affected by interference may be possible. Forexample, the interference influence region identifier 720 may be set as“1101101”.

The region affected by interference may be a region having puncturingand URLLC data (URLLC packets) 420 and 425 inserted therein (orallocated thereto) in the eMBB packet 410. Namely, a puncturing regionof the eMBB packet 410 may be referred to as a region affected byinterference or an interference-affected region. Therefore, terms suchas interference-affected region, interference influence regionidentifier, puncturing information, and information about a puncturingregion may be used together.

The interference influence identifier 710 and/or the interferenceinfluence region identifier 720 may be contained in the interferenceinfluence information 700 and transmitted to the terminal 320 when theHARQ retransmission packet is transmitted through the control channel.

Alternatively, in some embodiment, the base station 310 may transmit theinterference influence information 700 to the terminal 320 even beforereceiving the HARQ ACK/NACK signal from the terminal 320. Also, the basestation 310 may retransmit the eMBB packet affected by interference tothe terminal 320 even before receiving the HARQ ACK/NACK signal from theterminal 320.

Meanwhile, in some embodiment, the base station 310 may add theinterference influence information 700 to the control channel andtransmit the interference influence information 700 to the terminal 320.For example, the interference influence information 700 may be added toPDCCH or EPDCCH as an m-bit identifier and transmitted to the terminal320. Here, the size of the m bits may be determined by how many regionsthe data area is divided into. Also, in some embodiment, theinterference influence information 700 may be transmitted through DCI ofPDCCH.

The terminal 320 that receives the interference influence information700 including the information 720 about the region affected byinterference may estimate a detailed region affected by interference(i.e., a detailed puncturing region) by using the LLR value stored in asoft buffer. Namely, the terminal 320 that receives information about arough region (e.g., a symbol group, a mini-slot group, a slot, etc.)including the region affected by interference through the interferenceinfluence region identifier 720 may estimate the detailed puncturingregion by using this information and the LLR value. A relateddescription will be described later.

The operation of the base station 310 will be described in more detailwith reference to FIG. 8. At step 810, the base station 310 may createan eMBB transmission (Tx) signal. The eMBB transmission signal is asignal serviced by the eMBB system using the first TTI 440, and mayinclude the eMBB packet and control information thereof.

At step 820, the base station 310 may determine whether the eMBBtransmission signal is affected by the URLLC transmission signal.Namely, the base station 310 may determine whether the eMBB packet 410is affected by interference of the URLLC packets 420 and 425.

If the eMBB packet 410 is affected by interference of the URLLC packets420 and 425, the base station 310 may set, at step 830, information 710about whether there is influence of URLLC interference. For example, thebase station 310 may set the URLLC interference influence identifier 710to 1. The URLLC interference influence identifier 710 may be stored inthe base station 310 until a response signal for the transmission signalis received. Then the base station 310 may transmit the eMBB signal tothe terminal 320.

In addition, at step 830, the base station 310 may further setinformation 720 about a region affected by interference due to a signalof any other system. For example, the base station 310 may add a 1-bitidentifier per two OFDM symbols to set a 7-bit URLLC interferenceinfluence region identifier 720 per subframe. In an example of FIG. 7,the URLLC interference influence region identifier 720 may be set to andstored as 0010010.

In another embodiment, when the eMBB packet 410 is affected byinterference of the URLLC packets 420 and 425, the base station 310 maytransmit the interference influence information 700 including the setURLLC interference influence region identifier 720 to the terminal 320.Namely, even before receiving the HARQ ACK/NACK signal from the terminal320, the base station 310 may transmit the eMBB signal and then transmitthe interference influence information 700 to the terminal 320 at step830. In this case, the interference influence information 700 mayfurther include the URLLC interference influence identifier 710. Also,the base station 310 may retransmit the eMBB packet at step 860regardless of whether the HARQ NACK signal is received from the terminal320. For example, if the eMBB signal is transmitted in the n-th eMBBTTI, the interference influence information 700 may be transmittedthrough the (n+k)-th eMBB TTI. In this case, the (n+k)-th eMBB TTI maybe ahead of the retransmission eMBB TTI according to the HARQ ACK/NACK.Also, if the eMBB signal is transmitted in the n-th eMBB TTI, theretransmission eMBB packet may be transmitted through the (n+k)-th eMBBTTI which may be ahead of the retransmission eMBB TTI according to theHARQ ACK/NACK.

On the other hand, if the eMBB packet 410 is not affected byinterference of the URLLC packets 420 and 425, the base station 310 mayset, at step 840, the URLLC interference influence identifier 710 tocorrespond to be false (e.g., set the URLLC interference influenceidentifier to 0). The URLLC interference influence identifier may bestored in the base station 310 until a response signal for thetransmission signal is received. Then the base station 310 may transmitthe eMBB signal to the terminal 320. In this case, the base station 310may not set the URLLC interference influence region identifier 720(i.e., only the URLLC interference influence identifier 710 may becontained in the interference influence information 700), or set theURLLC interference influence region identifier 720 as a default value,or set the URLLC interference influence region identifier 720 to0000000.

Meanwhile, in another embodiment, the base station 310 may transmit theeMBB signal to the terminal 320 at step 830 or 840 and then check aresponse message for the eMBB transmission signal at step 850.

If the ACK signal for the transmission signal is received, the basestation 310 may create the next eMBB transmission signal and transmitthe created signal to the terminal 320 at step 870. In some embodiment,the base station 310 may initialize the URLLC interference influenceidentifier 710 and/or the URLLC interference influence region identifier720 stored at step 830 or 840 if the ACK signal is received from theterminal 320.

On the other hand, if the NACK signal for the transmission signal isreceived, the base station 310 may retransmit the eMBB packet at step860. At this time, the base station 310 may transmit the URLLCinterference influence identifier 710 set at step 830 or 840 to theterminal 320 together with the retransmission signal.

In this case, if the URLLC interference influence region identifier 720is set at step 830, the base station 310 may transmit the URLLCinterference influence region identifier 720 to the terminal 320together with the retransmission signal at step 860.

In some embodiment, the base station 310 may add the URLLC interferenceinfluence identifier 710 and/or the URLLC interference influence regionidentifier 720 to the control channel and transmit the URLLCinterference influence identifier 710 and/or the URLLC interferenceinfluence region identifier 720 to the terminal 320. For example, theinterference influence information 700 including the URLLC interferenceinfluence identifier 710 and/or the URLLC interference influence regionidentifier 720 may be added to PDCCH or EPDCCH and transmitted to theterminal 320. In this case, the URLLC interference influence identifier710 may be 1 bit, and the URLLC interference influence region identifier720 may have a size of 7 bits when the URLLC interference influenceregion identifier 720 is set to 1 bit per 2 OFDM symbols.

Also, in some embodiment, the base station 310 may initialize the URLLCinterference influence identifier 710 and/or the URLLC interferenceinfluence region identifier 720 after transmitting the retransmissionsignal including the URLLC interference influence identifier 710 and/orthe URLLC interference influence region identifier 720 to the terminal320.

Next, the operation of the terminal 320 will be described in more detailwith reference to FIG. 9. At step 910, the terminal 320 may receive asignal. This signal may be an eMBB signal. In some embodiment, theterminal 320 may perform channel compensation and create a bit LLR forthe received signal.

At step 920, the terminal 320 may determine whether the signal receivedat step 910 corresponds to a new signal or a retransmission signal.

If it is determined at step 920 that the signal received at step 910 isa new signal, the terminal 320 may perform a channel decoding at step960.

On the other hand, if it is determined at step 920 that the signalreceived at step 910 is not new signal, the terminal 320 may determinethis signal as a retransmission signal.

In addition, at step 930, the terminal 320 may check the interferenceinfluence information contained in the received retransmission signal.Since the interference influence information may include the URLLCinterference influence identifier 710, the terminal 320 may confirmwhether the signal received before the retransmission signal received atstep 910 is affected by interference of the URLLC packets 420 and 425.Namely, by checking the URLLC interference influence identifier 710, theterminal 320 may know whether the previously received signal is affectedby interference of a signal of the URLLC system.

If it is determined that the previously received signal is not affectedby interference of the URLLC signal, the terminal 320 may combine, atstep 940, the currently received retransmission signal with the LLRstored for the previously received signal.

On the other hand, if it is determined that the previously receivedsignal is affected by interference of the URLLC signal, the terminal 320may check URLLC interference influence region information at step 950.Namely, the terminal 320 may select a region unaffected by URLLCinterference by checking the URLLC interference influence regionidentifier 720 and then identifying a region affected by URLLCinterference in the previously received signal. For example, theterminal 320 may set the LLR of the region affected by URLLCinterference to zero. Then the terminal 320 may combine the currentlyreceived retransmission signal with the LLR of the region unaffected byURLLC interference in the previously received signal.

For example, in the case of FIG. 7, the terminal 320 may check the URLLCinterference influence region identifier 720, thereby identifying thefirst region 431, the second region 432, the fourth region 434, thefifth region 435 and the seventh region 437 where the eMBB packet 410 isnot affected by interference of the URLLC packets 420 and 425. Then theterminal 320 may select the first region 431, the second region 432, thefourth region 434, the fifth region 435 and the seventh region 437 inthe previously received signal and combine the currently receivedretransmission signal with the LLRs for these selected regions.

On the other hand, a part of the retransmission signal which is notoverlapped with the previously received signal may be reflected as a newparity or a systematic value.

In this case, the LLR for a region having a CRC fail but having a largevalue other than the LLR value of 0 in the previously received signalsmay be excluded, thereby preventing deterioration.

Meanwhile, in case of receiving information about a rough region (e.g.,a symbol group, a mini-slot group, a slot, etc.) including the regionaffected by interference through the interference influence regionidentifier 720, the terminal may estimate a detailed puncturing regionby using the interference influence region identifier 720 and the LLRvalue stored in the soft buffer thereof through blind detection.

For example, the base station 310 may transmit the information 720 aboutthe puncturing region affected by interference in units of code block(CB) to the terminal 320. In this case, the terminal 320 may estimatethe puncturing region in units of mini-slot by using the receivedinformation 720 and the LLR value stored therein. Then the terminal 320may set the LLR value corresponding to the punctured mini-slot to 0, andcombine the LLR value with the LLR value of the newly received signal.

Alternatively, for example, the base station 310 may transmit theinformation 720 about the puncturing region affected by interference inunits of mini-slot group to the terminal 320. In this case, the terminal320 may estimate the puncturing region in units of mini-slot or in unitsof OFDM symbol by using the received information 720 and the LLR valuestored therein. Then the terminal 320 may set the LLR valuecorresponding to the punctured mini-slot or the punctured OFDM symbol to0, and combine the LLR value with the LLR value of the newly receivedsignal.

For this, using the rough puncturing information 720 indicated by thebase station 310, the terminal 320 may set a reference value as anaverage of absolute values of LLR values of the non-punctured regions(i.e., regions unaffected by interference) in the previously receivedsignal.

For example, one transport block (TB) may be composed of several codeblocks (CB). In this case, if the base station 310 instructs theterminal 320 on the puncturing information 720 in units of CB, theterminal 320 may set the reference value as an average of absolutevalues of LLR values for non-puncturing CBs.

Similarly, if the base station 310 instructs the terminal 320 on thepuncturing information 720 in units of mini-slot group, the terminal 320may set the reference value as an average of absolute values of LLRvalues for non-puncturing mini-slot groups.

Thereafter, the terminal 320 may divide the puncturing region, indicatedthrough the puncturing information 720 by the base station 310, intosmall regions, e.g., OFDM symbols, mini-slots, PRB groups, or PRBs. Thenthe terminal 320 may calculate an average of absolute values of the LLRvalues for each region, and then compare the average with x % of thepreviously determined reference value to determine whether the region isa punctured region.

If the calculated average of the LLR values is smaller than x % of thereference value, the terminal 320 may determine that the correspondingregion is a punctured region. Then the terminal 320 may set the LLRvalue to 0 and perform combining with the LLR value of a newly receivedsignal.

If the calculated average of the LLR values is greater than x % of thereference value, the terminal 320 may determine that the correspondingregion is not punctured. Then the terminal 320 may maintain the LLRvalues and perform combining with the LLR value of a newly receivedsignal.

After step 940 or 950 or if the new signal is received as a result ofdetermination at step 920, the terminal 320 may perform a channeldecoding at step 960. Then the terminal 320 may perform a CRC check atstep 970.

If the CRC check is successful, the terminal 320 may transmit an ACKmessage to the base station 310 at step 980.

If the CRC check fails, the terminal 320 may transmit a NACK message tothe base station 310 at step 990. At this time, in some embodiment, theterminal 320 may create and store a bit LLR for the currently receivedsignal. Alternatively, the terminal 320 may store the LLR created atstep 910. Thereafter, the terminal 320 receives the signal retransmittedby the base station 310 in response to the NACK message.

As discussed heretofore, the base station 310 may add a several-bitindicator to the control channel of the HARQ retransmission packet so asto inform whether the previous transmission signal of the HARQretransmission packet is affected by interference of a signal of anyother system and also indicate information about theinterference-affected region, and then transmit the several-bitindicator to the terminal 320. Alternatively, the base station 310 maytransmit the interference influence information to the terminal 320 evenbefore receiving the HARQ ACK/NACK signal from the terminal 320. Also,the base station 310 may transmit the eMBB retransmission packet to theterminal 320 even before receiving the HARQ ACK/NACK signal from theterminal 320.

Then the terminal 320 receives the interference influence informationand the HARQ retransmission packet and, if the previously receivedsignal is affected by interference of the signal of any other system,may perform a channel decoding by combining a signal of a region exceptthe interference-affected region in the previously received signal withthe retransmission signal.

FIG. 10 illustrates yet another example of interference influenceinformation in case of coexistence between an eMBB packet and a URLLCpacket according to an embodiment of the present disclosure, FIG. 11illustrates an example retransmission packet of a base station accordingto an embodiment of the present disclosure, FIG. 12 illustrates anexample operation of a base station according to still anotherembodiment of the present disclosure, and FIG. 13 illustrates an exampleoperation of a terminal according to still another embodiment of thepresent disclosure.

Referring to FIG. 10, the eMBB packet 410 may be transmitted through aspecific frequency region of all the subframes 430; 431, 432, 433, 434,435, 436 and 437 according to the first TTI 440. In addition, the URLLCpackets 420 and 425 may be scheduled according to the second TTI 450.For example, as earlier described in FIGS. 4 and 7, the first URLLCpacket 420 may be transmitted in the third region 433, and the secondURLLC packet 425 may be transmitted in the sixth area 436.

In this case, the base station 310 may inform the terminal 320 ofinformation as to whether a transmission signal before an HARQretransmission packet is affected by interference due to a signal of anyother system. In addition, as earlier described in FIGS. 3 to 6,interference influence information 1000 may include an interferenceinfluence identifier 1010, e.g., a URLLC interference influenceidentifier.

Additionally, the interference influence information 1000 may furtherinclude information 1020 about a region affected by interference due toa signal of another system. For example, as earlier described in FIGS. 3to 9, the information 1020 about the region affected by interference maybe referred to as an interference influence region identifier 1020.

As shown in FIG. 11, the base station 310 may preferentially retransmitsignals 1110 and 1120 affected by interference of the URLLC packets 420and 425 to the terminal 320.

For example, as seen from FIG. 10, the eMBB packet 410 is affected byinterference of the first URLLC packet 420 in the third region 433 andalso affected by interference of the second URLLC packet 420 in thesixth region 436. In this case, the base station 310 may preferentiallytransmit the signal 1110 sent in the third region 433 and the signal1120 sent in the sixth region 436 among the eMBB packet 410 to theterminal 320. In this case, the number of resource blocks (RBs) used forretransmission can be greatly reduced. Meanwhile, in some embodiment, incase of preferentially retransmitting the eMBB part affected by URLLCinterference, the base station 310 may also retransmit some partsunaffected by the URLLC interference to utilize the resource block asmuch as possible. At this time, the base station 310 may transmit theretransmission packets 1110 and 1120 to the terminal 320 in units ofOFDM symbol, RB, RB group, RE, RE group, CB, or CB group.

When the base station 310 preferentially retransmits the signals 1110and 1120 affected by the URLLC packets 420 and 425 to the terminal 320,the terminal 320 needs to recognize that the signals 1110 and 1120affected by the URLLC packets 420 and 425 are preferentiallyretransmitted.

Therefore, in this case, the base station 310 may insert information1030 about a retransmission signal type into the interference influenceinformation 1000. The information 1030 about the retransmission signaltype indicates whether the base station 310 retransmits only a signalfor a region affected by interference due to a signal of another system.This information 1030 may be formed of a 1-bit identifier. In case ofpreferentially retransmitting the signals 1110 and 1120 affected by theURLLC packets 420 and 425 to the terminal 320, the base station 310 mayset the retransmission signal type information 1030 to correspond to betrue (e.g., set the identifier to 1), and in the other case, the basestation 310 may set the retransmission signal type information 1030 tocorrespond to be false (e.g., set the identifier to 0).

Meanwhile, in some embodiment, if the interference influence information1000 includes the information 1020 about the region affected byinterference and/or the information 1030 about the retransmission signaltype, the interference influence identifier 1010 may not be included.

The interference influence identifier 1010, the interference influenceregion identifier 1020, and the retransmission signal type information1030 may be contained in the interference influence information 1000 andtransmitted to the terminal 320 when the HARQ retransmission packet istransmitted through the control channel.

Alternatively, in some embodiment, the base station 310 may transmit theinterference influence information 1000 to the terminal 320 even beforereceiving the HARQ ACK/NACK signal from the terminal 320. Also, the basestation 310 may retransmit the eMBB packets 1110 and 1120 affected byinterference to the terminal 320 even before receiving the HARQ ACK/NACKsignal from the terminal 320.

Meanwhile, in some embodiment, the base station 310 may add theinterference influence information 1000 to the control channel andtransmit the interference influence information 1000 to the terminal320. For example, the interference influence information 1000 may beadded to PDCCH or EPDCCH as an m-bit identifier and transmitted to theterminal 320. Here, the size of the m bits may be determined by how manyregions the data area is divided into. Also, in some embodiment, theinterference influence information 1000 may be transmitted through DCIof PDCCH.

The operation of the base station 310 will be described in more detailwith reference to FIG. 12.

Steps 1210 to 1250 are similar to steps 810 to 850 described withreference to FIG. 8, and a detailed description thereof will be omitted.

If the ACK signal is received at step 1250, the base station 310 maycreate the next eMBB transmission signal and transmit the created signalto the terminal 320 at step 1270. In some embodiment, the base station310 may initialize the URLLC interference influence identifier 1010and/or the URLLC interference influence region identifier 1020 stored atstep 1230 or 1240 if the ACK signal is received from the terminal 320.

On the other hand, if the NACK signal for the transmission signal isreceived, the base station 310 may retransmit the eMBB packet at step1260. At this time, the base station 310 may transmit the URLLCinterference influence identifier 1010 set at step 1230 or 1240 to theterminal 320 together with the retransmission signal.

In this case, if the URLLC interference influence region identifier 1020is set at step 1230, the base station 310 may transmit the URLLCinterference influence region identifier 1020 to the terminal 320together with the retransmission signal at step 1260.

Meanwhile, in some embodiment, if the URLLC packets 420 and 425interfere with the eMBB packet, the base station 310 may transmit theinterference influence information 1000 including the set URLLCinterference region identifier 1020 to the terminal 320. Namely, evenbefore receiving the HARQ ACK/NACK signal from the terminal 320, thebase station 310 may transmit the eMBB signal and the interferenceinfluence information 1000 to the terminal 320 at step 1230. Here, theinterference influence information 1000 may further include the URLLCinterference influence identifier 1010. The base station 310 mayretransmit the eMBB packet at step 1260 regardless of whether the HARQNACK signal is received from the terminal 320. For example, if the eMBBsignal is transmitted in the n-th eMBB TTI, the interference influenceinformation 1000 may be transmitted through the (n+k)-th eMBB TTI. Inthis case, the (n+k)-th eMBB TTI may be ahead of the retransmission eMBBTTI according to the HARQ ACK/NACK. If the eMBB signal is transmitted inthe n-th eMBB TTI, the retransmission eMBB packet may be transmittedthrough the (n+k)-th eMBB TTI, which may be ahead of the retransmissioneMBB TTI according to the HARQ ACK/NACK.

Meanwhile, as described above, the base station 310 may preferentiallyretransmit the signals 1110 and 1120 affected by interference of theURLLC packets 420 and 425 to the terminal 320. In this case, the basestation 310 may transmit the retransmission signal type information 1030indicating whether only the signal for the region affected byinterference of other system signal is retransmitted, to the terminal320 together with the retransmission signal. Meanwhile, in someembodiment, the retransmission signal may also include some parts otherthan the signals 1110 and 1120 affected by interference of the URLLCpackets 420 and 425. This can increase the utilization of the remainingresource element (RE) in the allocated RB.

In some embodiment, the base station 310 may add the URLLC interferenceinfluence identifier 1010 and/or the URLLC interference influence regionidentifier 1020 and/or the retransmission signal type information 1030to the control channel to be transmitted to the terminal 320. Forexample, the interference influence information 1000 including the URLLCinterference influence identifier 1010 and/or the URLLC interferenceinfluence region identifier 1020 and/or the retransmission signal typeinformation 1030 may be added to PDCCH or EPDCCH and transmitted to theterminal 320.

Then the base station 310 may initialize the URLLC interferenceinfluence identifier 1010 and/or the URLLC interference influence regionidentifier 1020 and/or the retransmission signal type information 1030.

Next, the operation of the terminal 320 will be described in more detailwith reference to FIG. 13.

Steps 1310 to 1340 are similar to steps 910 to 940 described withreference to FIG. 9, and a detailed description thereof will be omitted.

If it is determined at step 1330 that the previously received signal isaffected by interference of the URLLC signal, the terminal 320 may checkthe URLLC interference influence region information at step 1350.Namely, the terminal 320 may select a region unaffected by URLLCinterference by checking the URLLC interference influence regionidentifier 1020 and then identifying a region affected by URLLCinterference in the previously received signal. For example, theterminal 320 may set the LLR of the region affected by URLLCinterference to zero.

At this time, the terminal 320 may check whether the base station 310has preferentially retransmitted the signals 1110 and 1120 affected byinterference of the URLLC packets 420 and 425 to the terminal 320. Ifthe retransmission signal type information 1030 indicates that the basestation 310 does not preferentially retransmit the signals 1110 and 1120affected by interference of the URLLC packets 420 and 425 to theterminal 320, the terminal 320 may combine the currently receivedretransmission signal with the LLR of the region unaffected by URLLCinterference in the previously received signal as being similar to step950 in FIG. 9. Meanwhile, the terminal 320 may estimate a detailedpuncturing region through the blind detection described with referenceto FIG. 9.

On the other hand, if the retransmission signal type information 1030indicates that the base station 310 preferentially retransmits thesignals 1110 and 1120 affected by interference of the URLLC packets 420and 425 to the terminal 320, the terminal 320 may confirm that theretransmission signal is for a region affected by interference of theURLLC signal in the previously received signal. Then the terminal 320may control the interference-affected region in the previously receivedsignal, and perform an LLR combining of the signal of theinterference-unaffected region and the retransmission signal. Namely,the terminal 320 may replace the signal for the interference-affectedregion in the previously received signal with the retransmission signal.For example, the terminal 320 may confirm that the retransmission signalis eMBB signals corresponding to the third and sixth regions 433 and436, and then may replace the LLR values of the third and sixth regions433 and 436 in the previously received signal with the LLR value for theretransmission signal. At this time, since the LLR value of theinterference-affected region is set to 0, the LLR value of theretransmission signal may be implemented by addition operation with theLLR values of the regions 433 and 436.

If the retransmission signal includes some parts other than the signals1110 and 1120 affected by interference of the URLLC packets 420 and 425,the terminal 320 may combine a part other than the retransmission signalfor the region affected by interference of the URLLC signal in thepreviously received signal with the LLR value for the previouslyreceived signal. In addition, a part of the retransmission signal whichis not overlapped with the previously received signal may be reflectedas a new parity (or systematic) value.

After step 1340 or 1350 or if the new signal is received as a result ofdetermination at step 1320, the terminal 320 may perform a channeldecoding at step 1360. Then the terminal 320 may perform a CRC check atstep 1370.

If the CRC check is successful, the terminal 320 may transmit an ACKmessage to the base station 310 at step 1380.

If the CRC check fails, the terminal 320 may transmit a NACK message tothe base station 310 at step 1390. At this time, in some embodiment, theterminal 320 may create and store a bit LLR for the currently receivedsignal. Alternatively, the terminal 320 may store the LLR created atstep 1310. Thereafter, the terminal 320 receives the signalretransmitted by the base station 310 in response to the NACK message.

As discussed heretofore, the base station 310 may add a several-bitindicator to the control channel of the HARQ retransmission packet so asto inform whether the previous transmission signal of the HARQretransmission packet is affected by interference of a signal of anyother system, so as to offer information about the interference-affectedregion, and so as to offer information about the retransmission type,and then transmit the several-bit indicator to the terminal 320. Thenthe terminal 320 receives the HARQ retransmission packet and, if thepreviously received signal is affected by interference of the signal ofany other system, may perform a channel decoding by combining a signalof a region except the interference-affected region in the previouslyreceived signal with the retransmission signal. If the base station 310preferentially transmits a signal affected by interference of any othersystem, the terminal 320 may recognize the signal affected byinterference of any other system and then perform a channel decoding byreplacing this with the retransmission signal.

FIG. 14 illustrates an example base station according to an embodimentof the present disclosure.

Referring to FIG. 14, in an embodiment, the base station 310 may includea transceiver 1410 and a controller 1420. The controller 1420 controlsthe overall operations of the base station 310.

The controller 1420 of the base station 310 controls the base station310 to perform the operation of any one of the above-describedembodiments. For example, the controller 1420 may set interferenceinfluence information that includes information about interference ofthe second signal of the second system using the second TTI with regardto the first signal of the first system using the first TTI, and maytransmit the first signal of the first system to the terminal 320. If aretransmission request signal is received from the terminal 320, thecontroller 1420 may send a retransmission signal including theinterference influence information.

In addition, the transceiver 1410 of the base station 310 may transmitand receive signals in accordance with the operation of any one of theabove-described embodiments. For example, the transceiver 1410 maytransmit the first signal of the first system, receive theretransmission request message from the terminal 320, and transmit theretransmission signal to the terminal 320.

FIG. 15 illustrates an example terminal according to an embodiment ofthe present disclosure.

Referring to FIG. 15, in an embodiment, the terminal 320 may include atransceiver 1510 and a controller 1520. The controller 1520 controls theoverall operations of the terminal 320.

The controller 1520 of the terminal 320 controls the terminal 320 toperform the operation of any one of the above-described embodiments. Forexample, if the first signal of the first system using the first TTI isreceived from the base station 310, and if a channel decoding fails, thecontroller 1520 may send a retransmission request message to the basestation 310. Also, the controller 1520 may receive from the base station310 a retransmission signal that contains interference influenceinformation including information about interference of the secondsignal of the second system using the second TTI with regard to thefirst signal of the first system using the first TTI. And also, usingthe received interference influence information, the controller 1520 mayperform a channel decoding of a received signal for the retransmissionsignal.

In addition, the transceiver 1510 of the terminal 320 may transmit andreceive signals in accordance with the operation of any one of theabove-described embodiments. For example, the transceiver 1510 mayreceive the first signal of the first system from the base station 310,transmit the retransmission request message to the base station 310 whenthe channel decoding fails, and receive the retransmission signal fromthe base station 310. Although the present disclosure has been describedwith an exemplary embodiment, various changes and modifications may besuggested to one skilled in the art. It is intended that the presentdisclosure encompass such changes and modifications as fall within thescope of the appended claims.

What is claimed is:
 1. A communication method of a base station, themethod comprising: setting interference influence information includinginformation associated with interference of a second signal of a secondsystem using a second transmission time interval (TTI) with regard to afirst signal of a first system using a first TTI; transmitting the firstsignal of the first system to a terminal; and transmitting theinterference influence information to the terminal in a predeterminedtime.
 2. The method of claim 1, wherein the interference influenceinformation includes information indicating whether the first signal ofthe first system is affected by interference of the second signal of thesecond system.
 3. The method of claim 1, wherein the interferenceinfluence information includes information associated with a region ofthe first signal of the first system affected by interference of thesecond signal of the second system.
 4. The method of claim 1, furthercomprising: retransmitting a signal for a region of the first signal ofthe first system affected by interference of the second signal of thesecond system, wherein the interference influence information includesat least one of first information associated with aninterference-affected region of the first signal of the first system,and second information indicating that the signal for theinterference-affected region of the first signal of the first system isretransmitted.
 5. The method of claim 1, wherein the first systemcomprises an enhanced mobile broad band (eMBB) system, and wherein thesecond system comprises a ultra-reliable and low latency communication(URLLC) system.
 6. A communication method of a terminal, the methodcomprising: receiving a first signal of a first system using a firsttransmission time interval (TTI) from a base station; receivinginterference influence information including information associated withinterference of a second signal of a second system using a second TTIwith regard to the first signal of the first system from the basestation in a predetermined time; receiving a retransmission signal forthe first signal of the first system from the base station; andperforming a channel decoding of a received signal for theretransmission signal using the interference influence information. 7.The method of claim 6, wherein the interference influence informationincludes information indicating whether the first signal of the firstsystem is affected by interference of the second signal of the secondsystem, and wherein performing the channel decoding includes performingthe channel decoding without combining the received signal for theretransmission signal with the first signal of the first system if thefirst signal of the first system is affected by interference of thesecond signal of the second system.
 8. The method of claim 6, whereinthe interference influence information includes information associatedwith a region of the first signal of the first system affected byinterference of the second signal of the second system, and whereinperforming the channel decoding includes performing the channel decodingby combining the received signal for the retransmission signal with asignal of a region unaffected by interference of the second signal ofthe second system in the first signal of the first system if the firstsignal of the first system is affected by interference of the secondsignal of the second system.
 9. The method of claim 6, wherein theinterference influence information includes at least one of firstinformation associated with a region of the first signal of the firstsystem affected by interference of the second signal of the secondsystem, and second information indicating that a signal for aninterference-affected region of the first signal of the first system isretransmitted, and wherein performing a channel decoding includesperforming the channel decoding by combining the received signal for theretransmission signal with a signal of a region unaffected byinterference of the second signal of the second system in the firstsignal of the first system if the first signal of the first system isaffected by interference of the second signal of the second system andif the base station retransmits the signal for the interference-affectedregion of the first signal of the first system.
 10. The method of claim6, wherein the first system comprises an enhanced mobile broad band(eMBB) system, and wherein the second system comprises a ultra-reliableand low latency communication (URLLC) system.
 11. A base stationcomprising: a transceiver configured to transmit and receive a signal toand from a terminal; and a controller configured to: set interferenceinfluence information including information associated with interferenceof a second signal of a second system using a second transmission timeinterval (TTI) with regard to a first signal of a first system using afirst TTI; transmit the first signal of the first system to theterminal; and transmit the interference influence information to theterminal in a predetermined time.
 12. The base station of claim 11,wherein the interference influence information includes informationindicating whether the first signal of the first system is affected byinterference of the second signal of the second system.
 13. The basestation of claim 11, wherein the interference influence informationincludes information associated with a region of the first signal of thefirst system affected by interference of the second signal of the secondsystem.
 14. The base station of claim 11, wherein the controller isfurther configured to retransmit a signal for a region of the firstsignal of the first system affected by interference of the second signalof the second system, wherein the interference influence informationincludes at least one of first information associated with aninterference-affected region of the first signal of the first system,and second information indicating that the signal for theinterference-affected region of the first signal of the first system isretransmitted.
 15. The base station of claim 11, wherein the firstsystem comprises an enhanced mobile broad band (eMBB) system, and thesecond system comprises a ultra-reliable and low latency communication(URLLC) system.
 16. A terminal comprising: a transceiver configured totransmit and receive a signal to and from a base station; and acontroller configured to: receive a first signal of a first system usinga first transmission time interval (TTI) from the base station; receiveinterference influence information including information associated withinterference of a second signal of a second system using a second TTIwith regard to the first signal of the first system from the basestation in a predetermined time; receive a retransmission signal for thefirst signal of the first system from the base station; and perform achannel decoding of a received signal for the retransmission signalusing the interference influence information.
 17. The terminal of claim16, wherein the interference influence information includes informationindicating whether the first signal of the first system is affected byinterference of the second signal of the second system, and wherein thecontroller is further configured to perform the channel decoding withoutcombining the received signal for the retransmission signal with thefirst signal of the first system if the first signal of the first systemis affected by interference of the second signal of the second system.18. The terminal of claim 16, wherein the interference influenceinformation includes information associated with a region of the firstsignal of the first system affected by interference of the second signalof the second system, and wherein the controller is further configuredto perform the channel decoding by combining the received signal for theretransmission signal with a signal of a region unaffected byinterference of the second signal of the second system in the firstsignal of the first system if the first signal of the first system isaffected by interference of the second signal of the second system. 19.The terminal of claim 16, wherein the interference influence informationincludes at least one of first information associated with a region ofthe first signal of the first system affected by interference of thesecond signal of the second system, and second information indicatingthat a signal for an interference-affected region of the first signal ofthe first system is retransmitted, and wherein the controller is furtherconfigured to perform the channel decoding by combining the receivedsignal for the retransmission signal with a signal of a regionunaffected by interference of the second signal of the second system inthe first signal of the first system if the first signal of the firstsystem is affected by interference of the second signal of the secondsystem and if the base station retransmits only the signal for theinterference-affected region of the first signal of the first system.20. The terminal of claim 16, wherein the first system comprises anenhanced mobile broad band (eMBB) system, and the second systemcomprises a ultra-reliable and low latency communication (URLLC) system.